Andrew johnson was impeached, but not convicted, because

It would upset the balance of power among the three branches of government, that is why he is voted "not guilty".

Explanation:

Andrew Johnson was the 17th president of the United States.

He faced the charges of impeachment during his tenure when the "house of Representatives" passed the resolution against him for "high crime and misdemeanor".

Andrew Johnson was charged with the violation of the "Tenure of office act".

The above mention Act stated that the president could not remove appointed officials without the consent with congress.

Johnson removed the Secretary of war without the consent with congress.

Republicans, fearing that the removal of the president would upset the balance of power among the three branches of government.

Voted "not guilty".

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

i honesty don't know, good luck tho dawg