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In 2010, Americans started their own businesses at the highest rate in 15 years—but they were more apt to go at it alone, says a new study.

According to a study done by the Ewing Marion Kauffman Foundation, there were 565,000 new businesses created per month in 2010 (.34 percent of American adults created them). That's the same as the 2009 rate, but an uptick from 2007, and "represents the highest level over the past decade and a half," says the study. But the rate at which these businesses employ others dropped from .13 percent in 2007 to just .10 percent in 2010.

"Since it began, the recession has triggered annual declines in the rate of employer enterprise births," Carl Schramm, president and CEO of the Kauffman Foundation, said in a statement. "Far too many founders are choosing jobless entrepreneurship, preferring to remain self-employed or to avoid assuming the economic responsibility of hiring employees. This trend, if it continues, could have both short- and long-term impacts on economic growth and job creation.

The Kauffman Index of Entrepreneurial Activity, as it's called, tracks businesses from their first month of significant activity. (The owner must spend at least 15 hours per week on the business for two months consecutively, to rule out part-time business owners and very small business activities.)

Other study findings:

By race, Latinos' entrepreneurial activity increased the most. Latino business-creation rate rose from .46 percent in 2009 to .56 percent in 2010, the highest rate in 15 years. Entrepreneurial activity by Asians also rose, from .31 percent in 2009 to .37 percent in 2010. Business creation by African-Americans and non-Latino whites declined.

Immigrants were more than twice as likely to start businesses each month than were native born. The immigrant start-up business rate jumped from .51 percent in 2009 to .62 percent in 2010. The native-born rate is .28 percent. READ MORE