The major effect of the Battle of the Little Bighorn (where Custer and his men got annihilated) was that it really got Americans in general very angry at the Indians and much more motivated to end the wars.
Answer: It would be C; but the option choice B is close considering its the law of the land. But C would be correct.
The second answer, It had been at Pearl Harbor, is correct.
Two trig identities are of interest here:
... sin(x)² + cos(x)² = 1
... csc(x) = 1/sin(x)
Using the first one, you can subtract cos(x)², the take the square root to find
... sin(x) = ±√(1 - cos(x)²)
Using that in the second one, you have
... csc(x) = ±1/√(1 - cos(x)²) . . . . . . . . . . . . . matches the 3rd choice
