The correct answer please​

angered by the rapid pace of reconstruction

Explanation:

The Radical Republicans in Congress were angered by Johnson's actions. They refused to allow Southern representatives and senators to take their seats in Congress. In 1866, the Congress passed the Civil Rights Bill, which granted African Americans equal protection under the law with whites.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

the answer i chose to believe is 'harmony'