NASHVILLE, Tenn. (AP) — Tennessee has become a new front in the battle for the future of American democracy after Republicans expelled two Black lawmakers from the state Legislature for their part in a protest urging passage of gun-control measures. The removal of the lawmakers, who were only recently elected, reflects a trend in dozens of states where Republicans are trying to make it harder to cast ballots and challenging the integrity of the election process. At least 177 bills restricting voting or creating systems that can intimidate voters or permit partisan interference were filed or introduced in dozens of...