What 3 factors influence public opinion?

In communications studies and political science, mass media are often seen as influential forces on public opinion. Additionally, political socialization and behavioral genetics sometimes explain public opinion.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

i think it is true i hope this is