White people were apprehensive about the African-American soldiers. They didn't think that the soldiers were that good as soldiers since they didn't serve in a military and were new to all of the things in war. They also didn't consider themselves to be equal to them since they were white and the people in question were still African-American.
Some attitudes changed and some didn't. Although most of them still remained racists according to our contemporary understanding of the world, they did appreciate the african-american effort in the war since the african-americans worked hard and fought for the union and helped them win the war.
ANSWER: B) The president has to sign it.
EXPLANATION: There are eight steps of forming a bill into law which starts from drafting of the bill and ends when the president signs on it. There is one more step after president signing the bill which is if the senate decides to reject the bill, they can veto it and it will not be passed into a law. This step is an optional one and happens only if the president signs the bill after the bill does not get majority vote from both the houses. So, to conclude, president signing the bill can be considered as the last step of lawmaking process.
It Discourages new ideas. (Gradpoint answer). hope this helps.