How did Johnson violate the Tenure of Office act?

The political backing to begin impeachment came when Johnson breached the Tenure of Office Act by removing Edwin Stanton, Secretary of War, from his cabinet. ... The House of Representatives voted impeachment and the Senate tried the case. The trial lasted from March to May, 1868.

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President Johnson intended to remove Edwin Stanton.

Explanation:

The Mandate Act is a law in the United States that came into force in 1867 and was valid until 1887. The law sought to limit the powers of the United States president to remove people from certain positions without the consent of the senate. The president thus sought to eliminate Edwin Stanton from the post of Minister of War. He did not have the Senate's support for this action, which led to the recall of President Johnson in 1868. The explanation stated that Johnson violated the law in that way.

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"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.