When did the Germans definitively accepte the border on the Oder–Neisse line?
in 1948
in 1951
in 1970
in 1992
The Oder–Neisse line is the basis of the international border between Germany and Poland. After the revolutions of 1989, the newly reunified Germany and the newly democratic Republic of Poland definitively accepted the line as their border in the 1990 German–Polish Border Treaty. Poland joined the Schengen Area in 2007. This meant that all passport checks were removed along the border in December 2007. 
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in 1948
in 1951
in 1970
in 1992
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