Most Moroccans are, ethnically speaking, a mixture of the indigenous Berber population and Arab, which is also true of its neighbors Tunisia and Algeria.  French is the language of bureaucracy and business, so you need to know it if you're applying for a passport or buying a company.  But for everyday life it's helpful to know at least some, which is a mix of French and Arabic well as "Moroccan", which is simple sort of idiomatic Arabic.  People for the most part are super-friendly and love Americans - Morocco was one of the first countries to extend diplomatic recognition to the United States in 1777, and the first piece of foreign property acquired by the young US government was the US embassy in Rabat.  Today, Morocco and the US have a free trade agreement. Casablanca is a major city (the sixth largest in Africa) with a population of almost 4 million, so it's very  international.  In 2007 the city was rocked by 3 terrorist bombings, so obviously not everybody is happy with the arrangement, but for the most part the country, and especially the king, are friendly towards the United States.