<em>Baruch S. Blumberg invented </em><span><em>a vaccine for smallpox for which he won noble prize in 1976.</em></span>
Answer:
The main message was that the United states wouldn't interfere with any European affairs, and that the western hemisphere would be closed to European expansion.
Explanation:
This is because under the Monroe administration, they promised to stay out of European wars and affairs, and it was important for the still developing United States to strengthen it's army as well as it's economy.
The first was walled cities. Another is both offensive and defensive was a fleet of warships. And a third was alliance with other cities.
