Your generation does not care about race, you parents generation mostly pretends/are too polite to care, and your grandparents generation are just spouting stories from the past. You will have no issues at Iowa. I would be more concerned as a single woman (watch out at parties and walking late at night at any university) - than a person of color. Iowa people are rather warm hearted and pleasant as a group and don’t respond much to what they perceive as problems of larger states.