[1] Strongest in Greater Poland, Pomerania, Łódź and Silesia, it had around 150,000 members by the following year.

[1] It received around 5% of the vote in the 1922 elections, winning 18 seats in the Sejm and three in the Senate.

[2] The party was a member of the Józef Piłsudski governments until 1926, but then split into two factions; one retained the NPR name, whilst the other became known as NPR-Left.

The NPR-Left supported Piłsudski's Sanation regime, whilst the NPR, which had been reduced to around 80,000 members, opposed it.

The party's platform in 1921 called for social solidarity and a strong parliamentary democracy, and supported autonomy for national minorities except Jews.