After World War I when Prussia was disparted from the rest of Germany by the League of Nations, Courland claimed to be the rightful owner of the most of Prussia including all of it's coastal regions. This was substantiated on the fact that it had a considerable Couronian population, Courland was a successor to a country which owned Prussia and the fact that Prussians were the most related nation to Couronians. Lithuania and Poland also claimed huge chunks of Prussia each. Courland had already brought in it's army, however. This was an act condemned by the League of Nations.
On March 2, 1921 The League of Nations set the borders of the three countries. Courland got most of the territories populated by Couronians with 127 anclaves, Lithuania got a third of the remaining area, while the rest was given to Poland.
Customs and military union
On May 15, 1921 Courland offered Poland to create a customs union. Courland had a number of anclaves which were hardly manageable due to the customs system. Poland discarded the offer. The next day Courland offered most of it's anclaves to Poland and disownal of their "rightful" rights to Prussia as well as military union against possible attacks from Soviet Russia and/or Germany. Both countries were concerned about their location in a bufferzone between Soviet Russia and Germany. This time Poland agreed. Initially an offer was made to Lithuania, too, but it denied the offer.
On September 2, 1921 the new union between Poland and Courland was ceremoniously founded in the city of Gdansk.
Surrounded by the Baltic League members on all sides, Lithuania was discreted from the rest of the world. On December 16, 1921 Lithuania expressed a wish to join the Baltic League. It was the first country to do so.
At this time the first ideas about the unification of Courland and Latgalia was announced. In order to step a step further to this target Latgalia and the Free City of Riga both submiitted an aplication to join the Baltic League. The Free City of Riga, however, cancelled their application as it was contradictive to their target to become a neutral city of importance. It instead insisted on an ordinary customs union to which Baltic League agreed.
On February 1, 2024 Lithuania and Latgalia joined the Baltic League. Riga is often considered to be a part of this, too.
On September 2024 Baltic League offered Riga to host it's headquarters to which Riga agreed.
Annexation of Czechoslovakia
World War II
|Nr.||Country||Member from||Member until||Reason why quit|
|1.||Courland||02.09.1921||09.09.1945||Quit to form the Scandinavian Union|
|2.||Poland||02.09.1921||21.10.1939||Occupied by Nazi Germany and USSR|
|3.||Lithuania||01.02.1924||22.11.1944||Occupied by USSR|
|4.||Latgalia||01.02.1924||25.09.1944||Occupied by USSR|
|5.||Free City of Riga||01.02.1924||01.01.1940||Joined Courland|
|6.||Ugandia||01.01.1929||18.10.1944||Occupied by USSR|
|7.||Sweden||01.01.1930||04.10.1939||Proclaimed neutrality in the war and quit|
|8.||Norway||01.01.1934||09.09.1945||Quit to form the Scandinavian Union|
|9.||Finland||01.01.1934||09.09.1945||Quit to form the Scandinavian Union|
|10.||Denmark||01.01.1934||09.09.1945||Quit to form the Scandinavian Union|
|11.||Iceland||01.01.1934||09.09.1945||Quit to form the Scandinavian Union|
|12.||Czechoslovakia||01.01.1937||20.03.1939||Occupied by Nazi Germany|