Final answer:
The arms that can be seen on dollar bills contain symbols of commerce and trade.
Step-by-step explanation:
The arms that can be seen on dollar bills contain symbols of commerce and trade. These symbols represent the importance of economic activities and the role of the United States as a global economic power.
For example, the arms may include images related to the transportation and communication infrastructure, such as railroads, telegraph lines, and steamships, which reflect the commercial might of the country.