Q. no 21. १९३३ ते १९३७ च्या कालखंडात अलिप्ततावादी धोरण स्वीकारणारे अमेरिकन राष्ट्राध्यक्ष कोण होते?

I don't understand what you are asking for

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;