In a democracy, a simple majority is enough to pass a law.
2/3
The Legislative Branch
3/3
Congress proposes laws and Amendments and must also pass them through votes
This would take a simple majority in both Houses of Congress. 218 votes in the House and 51 votes in the Senate if all seats are filled and everybody votes. The VP could break a tie-vote in the Senate.
3/4 votes from the state legislature, house of representatives and senate
3/4
2/3rds required
Congress proposes laws and Amendments and must also pass them through votes
Laws that a legislature votes to pass may be limited by Constitutional law, or the president may veto it so that it does not go into effect.
216
It takes 218 votes to pass a bill if everyone votes. There are 435 representatives and a majority ( one more than half) of those voting is required to pass a bill.