Do we have to give TOEFL® test after giving IELTS for US universities?

[Rectifier]

Hey guys,

I am just confused about these two tests.
Are these tests substitute each other?
Do we have to give TOEFL test after giving IELTS for US universities?
Which universites in US accept IELTS?

Thanks

TOEFL listening lectures: Which country was not an important cotton grower in the 19th century?

[Cooliegirly]

Check with universities you are interested in applying for. Go on their websites, email their admissions counselors. Because policies vary from school to school.