1. California Becomes a State: September 1, 1850 was the day when California officially became a state of the United States of America after being admitted into the Union as the 31st state.

2. Giant Sequoia Trees Discovered: John Muir, a renowned naturalist and conservationist, discovered the giant sequoia trees in the Sierra Nevada mountains on September 1, 1875. These trees, which are the world's largest by volume, are a unique feature of California's natural landscape.

3. Golden Gate Bridge Begins Construction: On September 1, 1933, construction began on the iconic Golden Gate Bridge in San Francisco. The bridge, which spans the Golden Gate Strait, has come to be an important symbol of California and is one of the most recognizable landmarks in the world.

4. California's First Automobile Race: On September 1, 1895, the first automobile race in California took place between San Francisco and San Jose. The race was organized by the San Francisco Chronicle newspaper and covered a distance of approximately 50 miles.

5. Yosemite National Park Established: On September 1, 1890, Yosemite National Park was established by the U.S. Congress. The park, which covers nearly 1,200 square miles in the Sierra Nevada mountains, is renowned for its natural beauty and is visited by millions of people each year.