Question?????????

Question

why is spanish in the americas reffered to as castellano ???????????????

Answer 1

because in the Spanish Constitution of 1978 they decided to define castellano as the official language of the whole State. (the others are gallego, leuskera and català.)
in addition to this, when you speak about spanish language you don't say "castellano" but "español" because they uses this term right now.

Answer 2

Castellano

Castilian Spanish sometimes is used to distinguish the Spanish of Spain from that of Latin America.

Castilian Spanish Sometimes is used simply as a synonym for neutral Spanish, especially when referring to the "pure" Spanish promulgated by the Royal Spanish Academy. (Note: Not Mexican or Chicano language).

Castilian Spanish & Andalusian dialects emerged in the Iberian Peninsula (Hispania) during the middle ages. The emergence of modern Spanish more or less coincided with the reconquest of Moorish Spain which was completed by Isabella of Castile & Ferdinand of Aragón. (Hence the name of Castilian).

It was during this time when the Spanish language arrived in America first through Cristóbal Colón’s exploratory travels, and then with the rest of colonizers, at the end of the fifteenth century.