The number of immigrants remained relatively small during the second wave of Arab immigration, primarily due to the restrictive immigration policies of the US. However, in 1965, the United States passed new immigration reforms, including the Immigration and Nationality Act of 1965, allowing a new wave of Arabs to immigrate. This new group of Arab immigrants was demographically similar to those that immigrated during the past 20 years; however, this wave differed largely in its scope and in their reasons for immigrating. In particular, Arab immigrants during this period were largely well-educated Muslims and children of previous immigrants. Between 1967 and 2003 some 757,626 Arabs came to the United States, nearly eleven times the number of immigrants during the second wave. Moreover, during this time, in addition to increasingly regular conflict between Israel and its Arab neighbors, this era was marked by widespread "intra-Arab warfare" and a general increase in religious, ethnic and sectarian tensions in the region. Also, the rise of Islamism in the Middle East during the past few decades helped further drain the region of its native Christian populations. Just as with the previous influx of Arab immigrants, the third major Arab immigration trend consisted of more Palestinians than any other group. The actual number of Palestinians who immigrated to the US during this time is not known because often the United States was not their first destination. Perhaps as many as a quarter of the nearly 800,000 Arabs that period were of Palestinian descent. The massive Palestinian exodus was further motivated by the 1967 Six-Day War. Further spurring Palestinian immigration were the intifada uprisings of 1987–1993 and 2000–2005.