We (U.S.) are the middle of the three major countries of North America: Mexico, if it wishes, may have Mano de Obra Dias; you (Canada), if you so wish, may have "Labour" Day. We, however, have "Labor" Day*. 
Nevertheless, we thank you for your post.


*which Pete furthers the labor by removing the "Dictionary" button so we have to open a 2nd browser tab and seek out the dictionary.com reference site for the translator since I know but a very little Spanish.