We design all of our shoes here in Colorado. Xero Shoes are responsibly, ethically, and fairly manufactured in China.
While we would love to manufacture in America, it is literally not possible at this time, in the same way it’s not possible to domestically manufacture the device you’re using to read this answer.
Performance footwear manufacturing moved to Asia in the 70s and shows no likelihood of moving back. Note that some companies that claim “made in America” are still sourcing their materials from overseas (or the US companies from which they buy their materials are doing so).
We visit and work with our factories multiple times per year.  We also have an on-the-ground manufacturing agent who oversees the factories when we're not there to ensure that conditions are good, workers are treated fairly, and the shoes are made in compliance with all local laws and regulations. The factories we use treat and pay their workers exceptionally well.
Companies much larger than ours use these same factories and have spent millions of dollars on audits to assure themselves and their wholesale partners about the quality and conditions.