Unity is important for an effective functioning of a country and for prevention of conflicts: if there was no unity, people could not finish bigger projects that require cooperation with others.
Diversity is important for innovation and creativity: if we were all the same, little would change and sometimes change is for better.
I don’t know why it was so successful at that
Answer:
The Mariscal-Spencer Treaty between Mexico and England in 1893.
Explanation:
I have a big brain
