The laws in the United States are made by Congress, which is the legislative branch of the federal government. Congress consists of two chambers: the House of Representatives and the Senate. Both chambers must pass the same bill by majority vote for it to become law. After that, the President has the option to sign the bill into law or veto it. Congress can override a presidential veto with a two-thirds majority in both the House and Senate.

More details:

• The House of Representatives has 435 members, with representation based on state population, and handles revenue bills and impeachment proceedings.
• The Senate has 100 members (two per state) and handles confirmations of presidential appointments and ratification of treaties.

• Bills start as ideas, are assigned to committees in both chambers for study, debated, and voted on.
• A conference committee resolves any differences between the House and Senate versions before final approval.
• The President’s role includes signing the bill into law or vetoing it, but Congress holds the ultimate legislative power.

Thus, the primary lawmaking power rests with the bicameral Congress under Article I of the U.S. Constitution.