The theme of the passage reflected in American society in the early 1800s was the growth of social reform movements despite source of regional resistance. Option A is correct.
It was a period of great growth for the United States, which became independent from Great Britain and received a series of immigrants from other countries for the promise of freedom and human and civil rights to citizens.
During this period, most inhabitants of the United States survived in rural areas, with growth in agricultural production and trade with other nations.
Therefore, the text demonstrates that there is a need for unity between the country to achieve greater security and development in the country, as in the passage in the text where the author states that the degree of security will depend on the number of people included under the same government.
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