On which ocean were steamboats used to carry goods and
people in the 1850s?

The Savannah was judged not a commercial success, and its engine was removed and it was converted back to a regular sailing ship. By 1848 steamboats built by both United States and British shipbuilders were already in use for mail and passenger service across the Atlantic Ocean—a 3,000 miles (4,800 km) journey.

during world war ii                                                      

paper money known as continental currency, or continentals.