1930 Census records list Montana's population as 537,606

1930 Drought returns (Chapter 18)

1932 Franklin Delano Roosevelt elected president

1933 New Deal begins (Chapter 18)

1933 18th Amendment to the U.S. Constitution repealed, ending Prohibition

1934 International Mine, Mill and Smelterworkers strike revitalizes Montana union movement (Chapter 18)

1934 Congress passes the Indian Reorganization Act (IRA)

1934–1940 Fort Peck Dam built (Chapter 18)

1936 Beartooth Highway opens (Chapter 17)

1937 Drought ends (Chapter 18)

1939 World War II begins in Europe (Chapter 18)