Most people in the US did not choose to become citizens until the mid 19th century. The process was much easier than naturalization today, though, presuming you were white and in some cases might be required to own property.

US also didn't have Jus soli citizenship until the whole civil war and slavery debacle. You had to go into a local court and show you lived in the US for a couple years, who would swear you in as a citizen. But most people didn't care about voting or holding office enough to bother.