California's unemployment rate dropped to 4% in September, the lowest level in four decades, the state's Employment Development Department said in a report Friday. The state has seen 115 months of continuous job growth, with 21,300 jobs added last month.

The San Francisco area and neighboring counties were at a 2% unemployment rate, as big tech companies such as Google, Facebook and Apple continue to expand.

Business services saw in an increase of 12,700 jobs from August to September, while manufacturing saw an increase of 4,100. Other sectors with strong growth include education and healthcare services along with trade, transportation and utilities.

Lynn Reaser, an economist at Point Loma Nazarene University in San Diego, told the Los Angeles Times that "California is not immune to risks faced in the rest of the U.S. and the world, but for now, the state's jobs machine continues to purr, defying recession fears."

California has the largest economy of any state in the country. The U.S. unemployment rate in September fell to 3.5%, the lowest since December 1969, with 136,000 jobs added.

Although there is job creation, the economy is growing at a slower pace. In 2018, the economy added an average of 223,000 jobs per month. An indicator of U.S manufacturing strength, the PMI manufacturers' purchasing index, also fell to its lowest level in nearly a decade last month.

Trade concerns, along with global recession fears, could be starting to take their toll on U.S. economy. Federal Reserve Chairman Jerome Powell lowered interest rates in July, and could further lower rates in order to boost economic growth and consumer spending.