Which innovation had the greatest impact on the availability of fresh beef on the us east coast by the end of the 19th century?

What from the columbian exchange had perhaps the biggest impact on the world?

Persons or group opposing or hostile to another person or group the definition word is

List five major cold war events that occurred internationally between 1945 and 1965. list five domestic events that occurred in the united states during the same period. make sure to include a brief description and the year of each event.