The news of Kia moving to Mexico was so important to Mexico's economy that the president made the announcement himself. On the same day that General Motors Co. (NYSE:GM) said it would be calling home Cadillac SRX crossover production from Mexico in a deal worked out with the United Auto Workers union, South Korean automaker Kia Motors Corp. (KRX:000270) said it will spend more than $1 billion to construct its first auto manufacturing plant in Mexico, according to the Spanish-language El Financiero news agency.