Check my answers?

True/False South Carolina was allowed by Congress to nullify federal tariffs which hurt their economy.

False, the Senate came up with a Compromise where federal tariffs would be reduced for SC.

One of the most dependable & profitable sources of income for the US during the 19th century was the sale of ?
I'm not sure if it is tobacco or cotton, but I'm leaning towards cotton

Before 1850, Chinese made up the largest single group of immigrants
to the US. False

In the mid-19thcentury waves of immigrants came to the US, most of them from (blank) and (blank)? I'm not sure if it includes old immigrants or if it's just new immigrants because the old immigration period did not end until 1880, which is a part of mid-19th century

1. Yes. It's false.

2. Both were profitable. What does your book say?

3, Yes. It's false. There were not many Chinese immigrants before 1850.

Based on the information you provided, here are the correct answers:

1) True/False: South Carolina was allowed by Congress to nullify federal tariffs which hurt their economy.
False. The correct answer is False. The Senate did come up with a Compromise where federal tariffs would be reduced for South Carolina, but they were not allowed to nullify the tariffs entirely.

2) One of the most dependable & profitable sources of income for the US during the 19th century was the sale of ?
The correct answer is cotton. The sale of cotton was indeed one of the most dependable and profitable sources of income for the US during the 19th century.

3) Before 1850, Chinese made up the largest single group of immigrants to the US.
False. The correct answer is False. Before 1850, Chinese immigrants were not the largest single group of immigrants to the US. The largest single group of immigrants before 1850 were actually the Irish.

4) In the mid-19th century, waves of immigrants came to the US, most of them from (blank) and (blank)?
For this question, you are correct in assuming that both old and new immigrants are included in the answer since the old immigration period did not end until 1880. In the mid-19th century, waves of immigrants came to the US, most of them from Europe (specifically countries like Germany and Ireland) and Asia (primarily Chinese immigrants).