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That is because Spain had both Christians and Jewish people besides Muslims in the country. The people had all religious rights and were allowed to be of different religion as long as they accepted that the Muslims rule and don't challenge political rule. In exchange they were allowed to uphold their traditions, have their courts, live life in whatever way they want to religiously.
Westinghouse payed attention to the problems of railroad signaling. By purchasing patents to combine with his own inventions, he was able to develop a complete electrical and compressed-air signal system. In 1883 he began to apply his special knowledge of air brakes to the problem of safely piping natural gas, and within two years he obtained 38 patents for piping equipment.
The world war one peace settlement created a bitterness and resentment.