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".

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."

i think they came to washington to protest