Every day a flurry of parts and products are shuttled between Texas and Mexico, part of a cross-border supply chain to make everything from cars and heavy duty machinery to flat screen televisions. The future of that partnership,

US President Donald Trump has threatened to slap a 25-percent tariff on Mexican goods on February 1, a move that analysts say would deal a heavy blow to Latin America's second-largest economy.

Americans buy $900 billion a year in food, cars, TVs, toys, appliances and other goods from Mexico and Canada. The cost of these products could rise if President Trump carries out his threat to apply 25% tariffs.