additionally, the denomination has its own agency for sending missionaries around the world (mission to the world)(mtw). through mission to the world well over 600 foreign missionaries are working in about 60 nations. mission to north america serves pca churches and presbyteries through the development of evangelism and church planting in canada and the usa. an average of 3 new churches are planted in a month in the 2 nations and currently has more than 300 mission churches in the united states alone. more than 40% of all congregations are less than 25 years old, due to church planting. the pca puts into the field the world's largest presbyterian mission force.