Why is there difficulty in passing amendments to the Constitution?

The founders made the amendment process difficult because they wanted to lock in the political deals that made ratification of the Constitution possible. Moreover, they recognized that, for a government to function well, the ground rules should be stable. ... From 1870 to today, only 12 amendments have been enacted

Explanation:

equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.

c. the passage of the fifteenth amendment