The 1890 U.S. Census records were destroyed by fire on January 10, 1921.
Probate records refer to wills, inventories, letters of administration and guardianship. They are usually held at the county courthouse unless archived and they are indexed by the name of the testator.
The 1930 census lists the value of the property if owned, or the monthly rental if rented. This could lead to locating deeds, tax or mortgage records.
Naturalization is the process by which U.S. citizenship is granted to a foreign citizen or national after he or she fulfills the requirements established by Congress in the Immigration and Nationality Act (INA).
When going through old papers, be on the lookout for a Certificate of Naturalization of your ancestor. It was given to them at the time of their Citizenship, however, it contains little information compared to the other naturalization paperwork.