- December. First immigration of 100 Koreans to Hawaii. After the 102 immigrants who arrived into Honolulu Harbor, the number of Koreans in Hawaii exploded to 7,000 within 2 years.
- Denmark–Korea Treaty of 1902
- March. Embarkment of construction upon the Seoul-Gaesung line, Dispatch of government officials with jurisdiction over Gando (간도,間島)
- May, first graduation of Medical School of Korean Empire. One of the first
- 신식 화폐 조례 발표, 간도에 관리 파견KO
- 1900January. Korean Empire became a member of the Universal Postal Union.
- 1900July. Seoul-Incheon railroad opened with completion of the Han River Bridge (한강철교,漢江鐵橋). The bridge later becomes part of the Hangang Railway Bridge. It is still in operation.
- 1900October. The Hanseung Secondary School (한성중학교,漢城中學校) was finished construction. It is the predecessor of Kyunggi High School (경기고등학교,京畿高等學校), one of the best high schools in Korea.
- 1900April. Construction of streetlamps on Jong-ro, Seoul. The Korean Empire opens its own exhibition pavilion in the Exposition Universelle of Paris.
- 1900January. First mail of Korea was sent.
- 1900인선 철도 개통, 만국 우표 연합 가입, 종로에 가로등 설치
- 1901Belgium–Korea Treaty of 1901
- 1901February. Proclamation of ordinances for the new currency (adoption of the Gold Standard). Franz Eckert arrived to Seoul for establishment of the Korean Imperial Marching Band. He composed the Korean Imperial National Anthem. It is to be noted he also composed the Kimigayo, the Japanese counterpart.
- 1901제주도 이재수의 난 일어남
- 1901October. Inauguration of the Jigye Ahmun (지계아문,地契衙門), a system to issue legal documents of property ownership (지계,地契). It marks the start of a modern cadastral survey project.
- 1903January. The Korean Empire became member of the International Committee of the Red Cross.
- 1903용암포 사건
- 1903February. Establishment of the Hanseung Bank (한성은행,漢城銀行). It is the present-day Shinhan Bank (신한은행,新韓銀行), one of the most prominent banks in Korea.
- 1903The first Korean immigrants to the United States arrive in Hawaii.
- 1903서울-개성 철도 착공, 첫 하와이 이민 100명 보냄
- 1903December. Collbran and Bostwick started construction of the Ttuk Island freshwater reservoir. The reservoir is still being used as the Ttuk Island Drainage basin 1 reservoir (뚝도수원지제1정수장,--水源地第一淨水場).
- 1903April. The Mitsui Corporation (三井グループ) sold a battleship to the Korean Empire for 250,000 Won. The ship, which was a reconstructed cargo ship for military usage, was a slapdash product by the Japanese and was extremely inefficient. The battleship was christened "KIS Yangmu" (양무호,楊武號), which means 'Growing the strength of a Nation'.
- 1904Russo-Japanese War
- 1904Battle off Ulsan
- 1904November. The Pre-dreadnought battleship KIS Gwangje (광제호,光濟號) started operation in Incheon, Korea. It had a displacement of 1,056 tonnes. Its full speed was 14.77 knots with 2483 horsepower. The engine was a triple-expansion steam engine. The battleship and was made by Kawasaki Shipbuilding Corporation (川崎造船) and was given the mission for patrolling the Western Korean maritime territory. It is also the first Korean battleship to be equipped with the wireless telegraph.
- 1904July. Landmark newspaper The Korea Daily News, predecessor to today's Seoul Shinmun, is founded by British journalist Ernest Bethell.
- 1904September. Jejungwon hospital in Seoul, was renamed Severance Hospital, added Severance Hospital Medical School and the attached School of Nursing.
- 1904March. The first meteorological observatories were constructed in Mokpo and various other places.
| - 1902 Turkestan earthquake
- February — Ban on intermarriage between Manchus and Han Chinese is lifted
- January — Empress Dowager Cixi returns to Beijing
- 1900June — Boxer Rebellion: Cixi responded to anti-foreign unrest by issuing the Imperial Decree of declaration of war against foreign powers in the Guangxu Emperor's name.
- 1900Boxer movement
- 1900Battle of Peking
- 1900Siege of the International Legations
- 1900Battle of Tientsin
- 1900Battle of the Taku Forts
- 1900Battle of Langfang
- 1900Battle of Shanhaiguan
- 1900Taiyuan massacre
- 1900August — Boxer Rebellion: Foreign troops enter Beijing
- 1900September — Boxer Rebellion: Foreign troops leave Beijing
- 1900June — Boxer Rebellion: Empress Dowager Cixi declares war on foreign powers
- 1900September — Boxer Rebellion: The Boxer Protocol is signed
- 1901Korean invasion of Manchuria
- 1901September — Boxer Rebellion: The Qing dynasty and Eight-Nation Alliance signed the Boxer Protocol, under which the Alliance was granted war reparations and the right to station troops in the capital Beijing.
- 1901July — The Zongli Yamen is replaced with the Ministry of Foreign Affairs
- 1901废八股,用策论。清廷簽署《辛丑條約》。
- 1903December — Manchu monopoly on posts in the Eight Banners is abolished
- 1904Russo-Japanese War
- 1904Siege of Port Arthur
- 1904Battle of Liaoyang
- 19041904 Douliu earthquake
| - 日英同盟締結。教科書疑獄事件により学校教科書が国定化される。八甲田雪中行軍遭難事件。JA
- January — Russo-Japanese War: Japan became the first Asian nation to sign a mutual defense pact with a European nation, Britain.
- 1900立憲政友会結成。軍部大臣現役武官制導入。
- 1901官営八幡製鐵所建設。
- 1904Russo-Japanese War
- 1904February — Russo-Japanese War: Japan launched a surprise torpedo attack on the Imperial Russian Navy at Port Arthur.
| - Drago Doctrine
- First Rose Bowl game played
- Newlands Reclamation Act
- 1900September 6, 1901 – McKinley is shot, in Buffalo, New York.
- 1900Treaty of Washington
- 1900President William McKinley reelected; Theodore Roosevelt elected vice president.
- 1900September 14, 1901 – President McKinley dies, Vice President Roosevelt becomes the 26th president
- 1900March 4, 1901 – President McKinley begins second term; Roosevelt becomes the 25th vice president.
- 1901Louis Armstrong born
- 1901Hay–Pauncefote Treaty
- 1901U.S. Steel founded by John Pierpont Morgan
- 1901부커 T. 워싱턴 백악관 만찬
- 1903The Wright brothers make their first powered flight in the Wright Flyer at Kitty Hawk, North Carolina
- 1903Big stick ideology
- 1903Hay–Bunau-Varilla Treaty
- 1903Ford Motor Company formed
- 1903First World Series
- 1903Hay–Herrán Treaty
- 1903Elkins Act
- 1903United States Department of Commerce and Labor created
- 1903Great Train Robbery movie opens
- 1903Harley-Davidson Motor Company created
- 1904Panama Canal Zone acquired
- 1904Louisiana Purchase Exposition
- 1904Roosevelt Corollary to Monroe Doctrine
- 1904인류학의 날
- 1904March 4, 1905 – President Roosevelt begins full term, Fairbanks becomes the 26th vice president
- 1904U.S. presidential election: Theodore Roosevelt elected president for full term; Charles W. Fairbanks elected vice president
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