Answer:
have both a free market and communist government system
Explanation:
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The situation that is considered reinforcement is Receiving a "thank you" from somebody after doing something nice.
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The immigrants who came to the United States of America between the years 1820 and 1860 changed the character of the country because they brought with them their own culture and values. This started mixing with the already present culture and values and gave birth to a new character to the country. Among the immigrants were several Irish and German people.
The major social sciences are Anthropology, Archaeology, Economics, Geography, History, Law, Linguistics, Politics, Psychology and Sociology.