What type of proposed legislation needs a two thirds majority vote in Congress and ratification in state legislatures?

Proposed constitutional amendments require a two-thirds majority vote in both the House of Representatives and the Senate, followed by ratification by three-fourths of state legislatures. This high threshold ensures that significant changes to the Constitution reflect a broad consensus across both federal and state levels. In addition to constitutional amendments, certain types of legislation, such as those affecting the powers of Congress or the states, may also require supermajority support depending on specific constitutional provisions.