What occurred at the Berlin conference of 1884

European nations gathered together to file formal complaints against African uprisings

European nations were invited to decide how to divide up the continent of Africa

African nations gathered together to file formal complaints against European injustices

African nations were invited to learn about the new industrial innovations that could improve their daily life

European nations were invited to decide how to divide up the continent of Africa

Explanation:

European nations were invited to decide how to divide up the continent of Africa

Explanation:

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

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.