Western alienation is another national-unity-related concept that enters into Canadian politics. Residents of the four western provinces, particularly Alberta, have often been unhappy with a lack of influence and a perceived lack of understanding when residents of Central Canada consider "national" issues. While this is seen to play itself out through many avenues (media, commerce, and so on.), in politics, it has given rise to a number of political parties whose base constituency is in western Canada. These include the United Farmers of Alberta , who first won federal seats in 1917, the Progressives (1921), the Social Credit Party (1935), the Co-operative Commonwealth Federation (1935), the Reconstruction Party (1935), New Democracy (1940) and most recently the Reform Party (1989).