Answer;
C. a common language.
In the 1800s, an important motivation for both "old" and "new" immigrants to settle in ethnic neighborhoods was a common language.
Explanation;
The old immigrants came from the northern or western Europe while the new immigrants came from southern or eastern Europe.
Old immigrants were protestant while the new immigrants were Catholic , Orthodox or Jewish.
The correct answer is: "limiting competition"
Regional trade blocks are intergovernment treaties through which several countries agree to eliminate trade barriers among its members, so that they can enjoy free trade and enhance competitiveness within the region. Moreover, they establish a joint external trade policy, setting tariffs and other trade barriers to favour<u> domestic producers cope with competitors from outside the block, limiting the foreigner's ability to compete with products from the trade bloc. </u>
Slave labor was needed, they needed people to plant those cash crops for them.
