Lithuania is a country in the Baltic region of Europe. It was a powerful empire that dominated much of eastern Europe in the 14th–16th centuries. The national flag of Lithuania, pictured on this postcard, was established in 1918. The yellow in the flag is meant to symbolize the sun and prosperity, the green is for the forests, the countryside, liberty, and hope, and the red represents the blood and bravery of those who have died for Lithuania.