Who's on the front of a US silver dollar?

Dollars from 1794 to 1935 - Miss Liberty. These are really made of silver.

1971-78 (not silver, actually cupronickel) - President Eisenhower

1979-1980 and 1999 (again, cupronickel) - Susan B. Anthony

2000-present (manganese/brass) - Sacagawea, regular series; various presidents, presidential series.