What was a significant consequence of the impeachment of Andrew Johnson?

The impeachment of Andrew Johnson had profound implications for the balance of power between the branches of government, particularly concerning presidential authority over appointments. Johnson's impeachment was driven largely by his violation of the Tenure of Office Act, which restricted the president's ability to remove certain officeholders without the Senate's approval. Although he was acquitted, the political fallout from the impeachment process reinforced the necessity of congressional oversight of presidential appointments and actions. This led to a more cautious approach by future presidents regarding their ability to dismiss officials without cooperation from the Senate. Thus, the impeachment ultimately resulted in significant limitations on presidential power over appointments, as Congress sought to assert its authority in the face of executive overreach.

Understanding this context clarifies why the other choices do not align with the main consequences of Johnson's impeachment. It did not notably strengthen the presidency or create a precedent for presidential immunity. While civil rights legislation emerged during the Reconstruction era, it was not a direct consequence of Johnson's impeachment specifically. Therefore, the correct response highlights the direct impact on the limitations of presidential powers following this pivotal political event.