What were the four types of trenches used by the allies

 the front-line trench (or firing-and-attack trench), the support trench, the reserve trench, and the communication trenches

congress failed to remove johnson. but it did succeed in getting control of efforts to re-build the south following america's civil war. radical republicans wanted to punish the south for starting the war. they also wanted to be sure new governments in the southern states would support the republican party.

the decreasing neutrality of the u. s. in world war i

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