Question: What was the planned, first devised by Raivis Zeltits, to form a federation of Central and Eastern European countries after World War I?

<P0-S0> During the later stages of World War II and the post-war period, German citizens and people of German ancestry were expelled from various Eastern European countries and sent to the remaining territory of Germany and Austria. <P0-S1>  After 1950, some emigrated to the United States, Australia, and other countries from there. <P0-S2>  The areas affected included the former eastern territories of Germany, which were annexed by Poland and the Soviet Union after the war, as well as Germans who were living within the prewar borders of Poland, Czechoslovakia, Hungary, Romania, Yugoslavia, and the Baltic States. <P0-S3>  The Nazis had made plans—only partially completed before the Nazi defeat—to remove many Slavic and Jewish people from Eastern Europe and settle the area with Germans. <P0-S4>  The post war expulsion of the Germans formed a major part of the geopolitical and ethnic reconfiguration of Eastern Europe in the aftermath of World War II, that attempted to create ethnically homogeneous nations within redefined borders. <P0-S5>  Between 1944 and 1948 about 31 million people, including ethnic Germans ('Volksdeutsche') as well as German citizens ('Reichsdeutsche'), were permanently or temporarily moved from Central and Eastern Europe. <SEP> <P1-S0> Tyer's Electric Train Tablet system is a form of railway signalling for single line railways used in several countries; it was first devised in Great Britain by engineer after the Thorpe rail accident of 1874, which left 21 people dead. <P1-S1>  It was used in New Zealand for close to 100 years until June 1994. <SEP> <P2-S0> Raivis Zeltīts (born 21 March 1992 in Riga) is a Latvian politician, national-conservative activist, and writer. <P2-S1>  He is the Secretary General of the National Alliance, as well as board member and leader of its youth organization. <P2-S2>  He was elected to the Marupe municipal council in the 2013 municipal elections and re-elected in 2017. <P2-S3>  Has bachelor's degree in history. <P2-S4>  He is the author of many articles both in Latvian and English about nationalism, geopolitics, and the idea of Intermarium in today’s Europe. <P2-S5>  Liberal news magazine “New Eastern Europe” has called Raivis Zeltits “a key promoter of "identitaire" ideology in Latvian politics” and writes that with the national-conservative news portal “The New Nationalism” “Zeltīts has created a political platform, linking the far right from the Baltic to the Black Sea”. <P2-S6>  On the 23d of August 2017 Zeltīts' first book “Par Nacionālu Valsti” (“On Nation State”) was published. <P2-S7>  It describes the ideas and tasks of Latvian nationalism in the 21st century in a systematic way . <SEP> <P3-S0> Międzymorze (] ), known in English as Intermarium, was a plan, pursued after World War I by Polish leader Józef Piłsudski, for a federation, of Central and Eastern European countries. <P3-S1>  Invited to join the proposed federation were the Baltic states (Lithuania, Latvia, Estonia), Finland, Belarus, Ukraine, Hungary, Romania, Yugoslavia and Czechoslovakia.