it's number d.
because Americans immunity system wasn't strong as for that of the Europeans
I hope it helps ;D
The 1848 Treaty of Guadalupe Hidalgo
Answer:
Where do most tornadoes occur?
Explanation:
Tornado Alley
Warm humid Summers and Mild Winters
A. First Amendment
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
Basically, it states people have right to the freedom of speech, religion, press, peaceful assembly, and petition