Read the following excerpt from a presidential proclamation issued in 1865 and answer the question below. I, Andrew Johnson, President of the United States, . . . hereby grant and assure to all white persons who have, directly or indirectly, participated in the existing rebellion, except as hereinafter excepted, a full pardon, but upon the condition, nevertheless, that every such person will . . . take and subscribe the following oath . . .

Source: Library of Congress

Why did Radical Republicans disagree with this proclamation?

Radical Republicans disagreed with this Presidential Proclamation because they thought that President Johnson is being too merciful towards the Southerners.

Explanation:

On May 29, 1865, President Andrew Johnson declared a Presidential Proclamation under which, with the purpose not to punish Southerners and quickly reunite the States, he granted political rights to those who swore their faithfulness towards the States.

In the viewpoint of Radical Republicans, this Presidential Proclamation was indulgent towards the Southerners who started the war. According to these Radical Republicans, these Southerners needed to be punished harshly.

Therefore, the reason why Radical Republicans disagreed with this proclamation was because they considered that President Johnson was being too merciful towards the Southerners.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain