Portugal flag

Courtesy of C4ss from postcrossing forum

The Flag of Portugal is the national flag of the Portuguese Republic. It is a rectangular bicolour with a field unevenly divided into green on the hoist, and red on the fly. The lesser version of the national coat of arms is centred over the colour boundary at equal distance from the upper and lower edges.

The conjugation of the new field colours, especially the use of green, was not traditional in the Portuguese national flag's composition and represented a radical republican-inspired change that broke the bond with the former religious monarchical flag. These colours were popularly propagandized as representing the hope of the nation (green) and the blood (red) of those who died defending it, as a means to endow them with a more patriotic and dignified, therefore less political, sentiment.

Poland flag

Courtesy of Lidia from g+

The flag of Poland consists of two horizontal stripes of equal width, the upper one white and the lower one red. The two colors are defined in the Polish constitution as the national colors. The national flag was officially adopted in 1919. Since 2004, Polish Flag Day is celebrated on May 2.

Cuba flag

Courtesy of Lidia from g+

The Cuban flag was created by Narciso López in June 25, 1849, and put together by Emilia Teurbe Tolón. The Cuban flag's origins date from 1849, when various movements to liberate Cuba from Spanish rule emerged, mainly among Cuban exiles in the United States. Anti-Spanish Cuban exiles under the leadership of Narciso López adopted a flag suggested by the poet Miguel Teurbe Tolón. His design incorporates three blue stripes, representing the three parts that the country was divided during the independence wars, central, occidental, and oriental areas of the country, and two white stripes symbolizing the purity of the patriotic cause. The red triangle (triangle of Masonic significance) stands for the blood shed to free the nation, which is placed where the star is, symbolizing the sky turned red from the blood shed in battle. The white star in the triangle stands for independence.