Book excerpt: Exploring the Tripod: Immigration, Security, and Economy in the Post-9/11 United States is an exploration of the changing relationship between immigration and security in the post-9/11 United States. While extensive research has been done about the effect of 9/11 in the US, whether the effect is related mostly to the socio-economic situation or not is largely ignored. The current problems facing the US are the new policies that deter future immigration, and in turn, affect the US economy. This study forces on the major changes taking place in the U.S. both in terms of national security, as well as economic downturn following 9/11 as well as the current Trump administration. When it comes to immigration before 9/11, security was not the overarching concern in the United States. The focus was on economic interest, skilled and unskilled labor, and family reunification. However, immediately after 9/11, security became indisputably prioritized. September 11 changed the way Americans started to look at security. Immigration continues to make significant contributions to the US economy, whether in terms of manual labor from Mexico and Central America or in terms of more skilled labor mainly from Asia. September 11, led to a thickening of the balance between economic needs and security needs in the United States. This research examines the swinging security-economic growth of the pendulum concerning integration policy.