What treaty was signed by the countries of western europe, along with canada and the united states, in april of 1949?
a. truman doctrine
b. warsaw pact
c. north atlantic treaty organization
d. marshall plan

The treaty that was signed by the countries of Western Europe, along with Canada and the United States, in April of 1949 was C) North Atlantic Treaty Organization (NATO).
The document was signed as a defense mechanism against any enemy external party. The organization's headquarters can be found in Haren, Brussels, Belgium.