<em>a lack of immunity to certain diseases</em>
The first meeting of Montezuma and Cortes was quite cordial. The Aztec ruler regarded Cortes with keen interest. He even received the gifts from the Mexican well. Cortes boldly put a necklace on the neck of the prince and even wanted to hug him if he did not thought it was going to be too much.
B. Taft-Hartley Act is the answer
Goes through the House of Representatives and the Senate
Http://news.bbc.co.uk/2/hi/europe/country_profiles/1038669.stm
Look at the link it has an entire breakdown.