What is a Reform Movement?

Me with this psychology homework, i’m struggling with it.

How many countries were represented at the paris negotiations (where the treaty of versailles was signed) in january 1919?

When an amendment is ratified by three-fourths of congress or by three-fourths of state legislatures, it becomes part of the federal constitution, and all states—even those that did not ratify the amendment—must follow the laws in the new amendment. true or false