How often do americans elect members of the us senate?

The terms themselves are 6 years long; but the elections are staggered, so every 2 years 1/3 of the senators is being elected.

So the answer is: 2, Americans elect members of the US Senate every 2 years (but perhaps not all states vote every time).

The  frame of government of pennsylvaniawas a constitution for the  province of pennsylvania a  proprittarycoony granted to  william penne by  charles ii of england. the frame of government has lasting historical importance as an important step in the  development of american and world democracy.