What did president roosevelt do to show u. s. military power?

He sent out the great white fleet, is the right answer.

Explanation:

The Great White Fleet was the famous nickname for the mighty Navy battle fleet of the United States. This fleet made a journey throughout the globe in the dates between 16th December 1907, to 22nd February 1909. This journey was completed on the command of the then President of the United States Theodore Roosevelt. The main aim of this fleet was to make friendly courtesy appointments to various countries while illustrating modern naval power of the United States to the world.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

the growing interconnectedness of the world through communication, trade, and the exchange of ideas is an important theme in the history of the 20th and 21st centuries.

explanation: