For the first question about the conflict between President Johnson and Congress after Lincoln’s assassination, the correct answer is:
Republicans disagreed with President Johnson's Reconstruction Plan.
President Johnson's approach to Reconstruction was seen by many Republicans, particularly the Radical Republicans, as too lenient towards the South, which led to significant tensions with Congress.
For the second question regarding the goals of reformers who wanted to help Native Americans in the late 1800s, the correct response is:
to encourage Native Americans to adopt the ways of Americans.
The reformers, often motivated by a belief in assimilation, sought to integrate Native Americans into mainstream American society, often through educational programs and promoting American cultural practices.