Can I hold multiple citizenship in The United States of America, Poland, and Canada?

The first answer is incorrect. The USA does not require its citizens to renounce citizenship if they obtain another one. The State Department says so at a href="http://travel.state.gov/travel/cis_pa_tw/cis/cis_1753.html" rel="nofollow"http://travel.state.gov/travel/cis_pa_tw…/a . Poland and Canada permit multiple citizenship so yes, you can be all three at the same time.