As we celebrate the 250th anniversary of the United States, it’s fun to think back to the history of Palo Alto. Our city dates back 257 years. A lot has happened over the years. Here’s a look back. 1769: Spanish Arrival. Spanish explorers set up camp by a giant redwood tree. They named this tree El Palo Alto, which means “the tall tree” in Spanish. 1844: Juana Briones Arrives. A mother of 11, healer, landowner and entrepreneur, Briones ran a dai…