Guarding the gates immigration and national security / [electronic resource] :

• 作者： LeMay, Michael C., 1941-
• 其他作者：
  • Praeger Security International.
  • Praeger Security International Ebooks
• 出版： Westport, Conn. : Praeger Security International
• 主題： National security--United States , United States--Emigration and immigration--History. , United States--Emigration and immigration--Government policy. , Electronic books.
• ISBN： 0313087091 (electronic bk.) 、 9780313087097 (electronic bk.)
• FIND@SFXID: CGU
• 資料類型: 電子書
• 內容註: Includes bibliographical references (p. 275-305) and index. 1. An overview of U.S. immigration policy -- 2. The open-door cycle, 1820-1880 -- 3. The door-ajar cycle, 1880-1920 -- 4. The pet-door cycle, 1920-1960 -- 5. The Dutch-door cycle, 1960-1990 -- 6. The storm-door cycle, 1990-? -- 7. Conclusion -- Glossary.
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