On what date other countries celebrate the Labor Day?

http://www.history.com/minisite.do?content_type=Minisite_Generic&content_type_id=341&display_order=1&sub_display_order=4&mini_id=1060

Who was the founder of the Labor Day?

http://www.history.com/minisite.do?content_type=Minisite_Generic&content_type_id=349&display_order=2&mini_id=1060

http://www.dol.gov/opa/aboutdol/laborday.htm

Why the Labor Day is celebrated?

http://www.history.com/minisite.do?content_type=mini_home&mini_id=1060

When was the Labor Day celebrated the first time in the United States?

http://www.dol.gov/opa/aboutdol/laborday.htm

http://www.history.com/minisite.do?content_type=Minisite_Generic&content_type_id=316&display_order=1&mini_id=1060