One of the significant changes in atmosphere in Jefferson's administration was:

the number of common people involved in government
the closing of the Bank of the United States
the widespread dismissal of Federalist officeholders
the reinstatement of the Alien and Sedition Acts

the number of common people involved in government

Which to you think is the answer.... we will be glad to help you further if you are wrong.

http://en.wikipedia.org/wiki/Thomas_Jefferson

The significant change in atmosphere during Jefferson's administration was the widespread dismissal of Federalist officeholders.

To arrive at this answer, we need to analyze the options and look for evidence or historical knowledge about Jefferson's presidency. Let's break down each option:

1. The number of common people involved in government: While Jefferson did strive to make government more accessible to common people and promoted agrarian values, there is no specific evidence or historical knowledge suggesting that this was a significant change in the atmosphere during his administration.

2. The closing of the Bank of the United States: The closure of the Bank of the United States was not a significant change during Jefferson's administration. It was actually a decision made by President Andrew Jackson in 1836.

3. The reinstatement of the Alien and Sedition Acts: The Alien and Sedition Acts were passed during John Adams' presidency, and they were highly unpopular. Jefferson, being a strong advocate for civil liberties, did not support these acts. Therefore, it is unlikely that their reinstatement took place during his administration.

4. The widespread dismissal of Federalist officeholders: This option is the correct answer. Jefferson, a Democratic-Republican, wanted to reduce the influence of the Federalist party in the government. Therefore, he initiated a policy of replacing Federalist-appointed officials with those who aligned with his party's principles. This led to a significant change in the atmosphere, as it represented a political shift and reshaped the federal government's composition.

By analyzing the options and considering historical knowledge, it becomes clear that the widespread dismissal of Federalist officeholders was the significant change in atmosphere during Jefferson's administration.