What events contributed to the start of modern era

after World War II, radical changes in newspaper production in particular and mass communication in general occurred on a par with those brought by the Industrial Revolution.

Explanation:

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers