Austrian "Anschluss"
Many Austrians still viewed themselves as “German,” not distinctly “Austrian,” because they shared a language, political views (for the most part), and a common racial type. Hitler himself had been born in Austria near the border, not Germany proper, and it gave him another reason for wishing to bring Austria into his Third Reich. He was particularly determined because the medieval Holy Roman Empire (known by some as the First Reich) had held both nations. However, for that very reason France and Great Britain had forbidden the union in the Treaty of Saint-Germain-en-Laye, knowing the union would make Germany far too powerful. The Austrian "Anschluss" (union) would be one of Hitler's greatest diplomatic successes and would influence his later conquests in Czechoslovakia.
"People of the same blood should be in the same Reich." ~ Hitler in Mein Kampf