Question

By 1860 the United States had almost 31,000a.clipper ships.c.canals.b.miles of telegraph lines.d.miles of railroad tracks.

Answer 1

d.miles of railroad tracks.

Step-by-step explanation:

On February 28, 1827, the United States launched its first train track, the Baltimore and Ohio railroad, and by 1860, the United States had almost 31,000 miles of train tracks.