When the Fortieth Congress convened in 1867, Republican lawmakers charted a new course for Reconstruction. With moderates and Radicals united against the president, Congress intended to force the former Confederate states not only to protect the basic civil rights of African Americans but also to grant them the vote. Moderates now agreed with Radicals that unless blacks had access to the ballot, they would not be able to sustain their freedom. Extending the suffrage to African Americans also aided the fortunes of the Republican Party in the South by adding significant numbers of new voters. By the end of March, Congress enacted three Military Reconstruction Acts. Together they divided ten southern states into five military districts, each under the supervision of a Union general (Map 14.1). The male voters of each state, regardless of race, were to elect delegates to a constitutional convention; only former Confederate officials were disfranchised. The conventions were required to draft constitutions that guaranteed black suffrage and ratified the Fourteenth Amendment. Within a year, North Carolina, South Carolina, Florida, Alabama, Louisiana, and Arkansas had fulfilled these obligations and reentered the Union.

Having ensured congressional Reconstruction in the South, Republican lawmakers turned their attention to disciplining the president. Johnson continued to resist their policies and used his power as commander in chief to order generals in the military districts to soften the intent of congressional Reconstruction. In response, Congress passed the Command of the Army Act in 1867, which required the president to issue all orders to army commanders in the field through the General of the Army in Washington, D.C., Ulysses S. Grant. The Radicals knew they could count on Grant to carry out their policies. Even more threatening to presidential power, Congress passed the Tenure of Office Act, which prevented Johnson from firing cabinet officers sympathetic to congressional Reconstruction. This measure barred the chief executive from removing from office any appointee that the Senate had ratified previously without returning to the Senate for approval.

Convinced that the new law was unconstitutional and outraged at the effort to limit his power, the quick-tempered Johnson chose to confront the Radical Republicans directly rather than seek a way around a congressional showdown. In February 1868, Johnson fired Secretary of War Edwin Stanton, a Lincoln appointee and a Radical sympathizer, without Senate approval. In response, congressional Radicals prepared articles of impeachment.

In late February, the House voted 126 to 47 to impeach Johnson, the first president ever to be impeached, or charged with unlawful activity. The case then went to trial in the Senate, where the chief justice of the United States presided and a two-thirds vote was necessary for conviction and removal from office. After a six-week hearing, the Senate fell one vote short of convicting Johnson. Most crucial for Johnson’s fate were the votes of seven moderate Republicans who refused to find the president guilty of violating his oath to uphold the Constitution. They were convinced that Johnson’s actions were insufficient to merit the enormous step of removing a president from office. Although Johnson remained in office, Congress effectively ended his power to shape Reconstruction policy.

The Republicans had restrained Johnson, and in 1868 they won back the presidency. Ulysses S. Grant, the popular Civil War general, ran against Horatio Seymour, the Democratic governor of New York. Although an ally of the Radical Republicans, Grant called for reconciliation with the South. He easily defeated Seymour, winning nearly 53 percent of the popular vote and 73 percent of the electoral vote.