By Joseph Ax WASHINGTON (Reuters) -Americans on Tuesday cast the final ballots in closely fought elections that will determine whether Democrats lose control of Congress, and with it the ability to push forward on President Joe Biden’s agenda in the next two years. The party that controls the White House typically loses seats in midterm elections. Polls suggest Tuesday’s results will be no exception, as concerns about high inflation and crime, as highlighted by Republicans, outweigh warnings from Democrats about the end of national abortion rights and the violent Jan. 6, 2021, assault on the U…