What must be true of a bill which has become law at a federal level?

It must have been signed by the president.
It must be in the best interest of all Americans.
It must have passed both the House and the Senate.
It must have been introduced into the Senate before the House

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To determine what must be true of a bill that has become law at a federal level, we need to understand the legislative process in the United States.

When a bill is first introduced in either the Senate or the House of Representatives, it goes through several stages before it becomes a law. Here are the general steps:

1. Introduction: A bill is introduced by a member of Congress in either the Senate or the House of Representatives.

2. Committee Review: The bill is reviewed and debated in a committee specific to the bill's subject matter. The committee may propose changes, amendments, or reject the bill.

3. Floor Debate and Vote: If the bill passes the committee, it will move to the floor of the originating chamber (either the Senate or the House) for a full debate and vote. Amendments may be proposed and discussed during the debate.

4. Second Chamber: If the bill passes in the chamber where it was introduced, it then moves to the other chamber, where it goes through a similar process of committee review, floor debate, and vote.

5. Conference Committee: If both chambers pass different versions of the bill, a conference committee may be created to reconcile the differences and create a single unified version.

6. Presidential Approval: Once both the Senate and the House of Representatives have approved the same version of the bill, it is sent to the President for approval. The President has the power to sign the bill into law or veto it.

Now, based on this process, we can determine what must be true of a bill that has become law at a federal level:

1. It must have passed both the House and the Senate: A bill needs to be approved by both the House of Representatives and the Senate before it can become a law.

2. It must have been signed by the President: After a bill has passed both chambers, it is sent to the President for approval. The President's signature is necessary for the bill to become law. However, it's important to note that if the President vetoes the bill, it can still become law if both the House and the Senate vote to override the veto by a two-thirds majority.

Therefore, the two essential requirements for a bill to become law at the federal level are that it must have passed both the House and the Senate, and it must have been signed by the President, or if vetoed by the President, overridden by a two-thirds majority in both chambers of Congress. The best interest of all Americans is not a formal requirement for a bill to become law, although lawmakers aim to create legislation that benefits the country as a whole. The order in which a bill is introduced (Senate before House or vice versa) is not a requirement for passage, as bills can originate in either chamber.