The Europeans were already familiar with most diseases (they themselves brought some diseases to the Americas) and so they developed immunity to those disease, but the Natives were unfamiliar with those diseases so their systems were still weak fighting those diseases off.
Answer:
he Haitian Revolution and the subsequent emancipation of Haiti as an independent state provoked mixed reactions in the United States. ... US president Thomas Jefferson recognized that the revolution had the potential to cause an upheaval against slavery in the US not only by slaves, but by white abolitionists as well.
Explanation:
Many machines formed in cities to serve immigrants to the U.S. in the late 19th century who viewed machines as a vehicle for political enfranchisement. Machine workers helped win elections by turning out large numbers of voters on election day.