The Civil War was the conflict the United States has ever fought. most controversial

deadliest

longest

costliest

why Hot try deadliest, because a lot Americans fight each other, and this war have the most death rate too

Deadliest

Explanation:

The Civil War maintains the highest American casualty total of any conflict. In its first 100 years of existence, over 683,000 Americans lost their lives, with the Civil War accounting for 623,026 of that total (91.2%).

harding's opponent in the 1920 election was ohio governor and newspaperman james m. cox, who had won the democratic nomination in a 44-ballot convention battle. harding rejected the progressive ideology of the wilson administration in favor of the laissez-faire approach of the mckinley administration.