Answer:
The road that was originally built to connect the Potomac River with the Ohio River, whose construction began in 1811, and that was the first road to be built with federal funds was the National Road.
Step-by-step explanation:
The National Road was the first interstate road in the United States, which was built from the money of the federal government. The road, about 600 miles long, connected the Potomac and Ohio rivers, while being a route to the West for thousands of settlers. When in the 1830s the road was rebuilt, the National Road was the first American road covered with macadam.