What is a patent? does the right it grants last forever

Need on these last 2 questions on my social studies homework 5 and 6 then i’m done with the homework

Define the term universal male sufferage and give examples of when it affected the revolutions of 1848

How did the boston massacre contribute to the writing of the declaration of independence? a. many colonists began to see the british government as a source of protection. b. many colonists began to see the british government as a supporter of free speech. c. many colonists began to oppose the british government's building of forts on the frontier. d. many colonists began to fear the british government's harsh actions toward the colonies.