1) Cows have best friends and can become stressed if they are separated.

2) The abolition of slavery in the United States was officially proclaimed with the ratification of the 13th Amendment to the Constitution in 1865.

3) The United Nations (UN) is an international organization founded in 1945 with the goal of promoting peace, security, and cooperation among nations through diplomatic and political means.

4) The eye of a cyclone is a region of calm, relatively clear skies and light winds at the center of the storm.