William McKinley assassinated; Theodore Roosevelt becomes president.

Antitrust lawsuit filed against Northern Securities Company.

Roosevelt mediates anthracite coal strike.

Panama Canal construction begins.

Roosevelt Corollary to Monroe Doctrine announced.

Pure Food and Drug Act and Meat Inspection Act enacted.

Hepburn Act enacted.

Panic on Wall Street causes economic downturn.

“Gentlemen's Agreement” made with Japan.

William Howard Taft elected president.