Mississippi river
The United States customary system (also called American system or, sometimes, "English units") is the most commonly used system of measurement in the United States.
The system of units used in the United States is called the United States customary units or US customary units. This system includes units such as feet, pounds, and gallons.
A republic is the name for such a system. The United States is a republic.
The United States is a free enterprise system.
United States Capitol subway system was created in 1909.
The United States of America
In the United States, the IBAN format is not used. Instead, the country uses a system called the ABA routing number and account number for bank transfers.
The United States does not use the metric system.
Adversarial system
The economic system of the United States is a capitalistic market economy, based primarily on free enterprise.
In the United States, the Head of the Armed Forces is called the Commander-in-Chief and this position is held by the President of the United States. The president is a civilian political officeholder. So the United States should be understood as having a military system that is under civilian control.
The Coinage Act of established the United States coinage system. It was also commonly known as the Mint Act.