What is a Constitutional Amendment?

A constitutional amendment is a modification of the constitution of a polity, organization or other type of entity. Amendments are often interwoven into the relevant sections of an existing constitution, directly altering the text.

two-thirds vote of both houses of Congress or by a special convention summoned by Congress on the petition of two-thirds of the state legislatures.

Explanation:

the graphs indicate that few people in bolivia work in industry, as that is the least expressive sector shown in the respective graphic.