Why Naturalize?

Not all immigrants to the United States naturalized, especially before the early twentieth century. It is possible your ancestor never bothered to naturalize. If your ancestor had no interest in voting, he may have never seen a need to naturalize as that’s a key element of citizenship. In some locations and in some time periods, aliens (generally non-naturalized immigrants) were not able to own land. State statute would indicate when that changed. During the time period when only citizens could own land, that was for many a key reason to naturalize.