History quiz

What is the most Important event in American history that start with alphabet O?

The Oregon Trail

The Oregon Trail was a 2,170-mile (3,500 km) east-west large-wheeled wagon route and emigrant trail that connected the Missouri River to valleys in Oregon. The Oregon Trail was a key migration route for settlers from the east coast of the United States to the Oregon Country in the mid-19th century. It was also used by fur traders, missionaries, and miners.