Respuesta :

Answer:

1900 – U.S. population exceeds 75 million.

1900 – U.S. helps put down Boxer Rebellion.

1900 – 1900 Galveston hurricane.

1900 – U.S. presidential election, 1900: William McKinley re–elected president; Theodore Roosevelt elected vice president.

Explanation:

Answer:

World War 1, World War 2, The Great Depression, The Cold War

Explanation:

WW1, WW2, and The Cold War are all obvious, pretty sure the great depression is another major event

If you meant decade then the answer above should help you