オーデル・ナイセ線
For decades, the CDU-controlled German government considered the Oder–Neisse line to be completely unacceptable. Even the Social Democrats of the SPD initially refused to accept the Oder–Neisse line. The 1991 Polish–German border agreement finalized the Oder–Neisse line as the Polish–German border. The agreement gave to minority groups in both countries several rights, such as the right to use national surnames, speak their native languages, and attend schools and churches of their choice. These rights had been denied previously on the basis that the individual had already chosen the country in which they wanted to live.