Attending college or university in the United States at a minimal cost or without incurring debts is possible. This is possible if you get a fully-funded university scholarship or by attending a tuition-free university to study in the USA.

This article on 10 tuition-free universities and colleges in the USA for Nigerian students in 2020 provides you with the necessary information you will need.
1. Berea College

2. Alice Lloyd College

3. Webb Institute

4. College of the Ozarks

5. Curtis Institute of Music

6. City University of New York (CUNY)

7. U.S. Academies

8. State of Washington Universities

9.Franklin W. Olin College of Engineering

10. Deep Springs College

Source: https://worldscholarshipforum.com/10-tuition-free-universities-usa-international-students/