Thaddeus a congressional leader during Reconstruction

He was a Radical Republicans leader.

Explanation:

He was a Radical Republicans leader and one of the most powerful members in the House of Representatives. He focused on civil rights, and eventually helped draft the 14th amendment. He dominated the House during the reconstruction and even proposed to impeach President Andrew Johnson.

a change of venue is the legal term for moving a trial to a new location. a change of venue request because venue is improper means that the removing defendant believes that the case may not be in that venue because it is improper under procedural rules.

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.