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The Constitution vests in Congress the power to pass legislation. A proposal considered by Congress is called a bill. If a majority of each house of Congress two-thirds should the President veto it - votes to adopt a bill， i becomes law. Federal laws are known as statutes.The United States Code is a “codification”of federal statutory law. The Code is not itselfa law， it merely presents the statutes in a logical arrangement.Title 20，for instance， contains the various statutes pertaining to Education，and Title 22 those covering Foreign Relations. Congresslawmaking power is limited. More precisely，it is delegated by the American people through the Constitution， which specifies areas where Congress may or may not legislate.Article I， Section 9 ofthe Constitution forbids Congress from passing certain types oflaws. Congress may not， for instance，pass an “ex post facto” law （a law that applies retroactively，or “after the fact”），or levy a tax on exports. Article I， Section 8 lists areas where Congress may legislate.Some of these （“To establish Post Offices”） are quite specific but others， most notably， “To regulate Commerce with foreign Nations， and among the several States，” are less so. Obviously the power to interpret the less precise delegations is extremely important. Early in the young republics history，the judiciar branch assumed this role and thus secured an additional and extremely vital role in the U.S.legalsystem.