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Other correlations between national IQs and other factors are available, Richard Lynn and Vanhanen claimed that national IQs are correlated with per capita income at a correlation of .73. However, when long GDP (1975 – 2003) were used, the correlations increased to .82 for 81 nations.  Further study confirmed the results for 185 countries (r =.65)  and for 152 countries (r =.76). 
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Trump said, "My policy is similar to what President Obama did in 2011 when he banned visas for refugees from Iraq for six months."
Hallin and Mancini identify the distinction between rational-legal authority and clientelism  as another crucial dimension. Following Max Weber , Hallin and Mancini use the term rational-legal authority in its meaning as a form of governance whose main influence is maintained through formal and universalistic rules of procedure, . an independent and autonomous administrative apparatus not affected by political and economic interests or lobbyism . This apparatus is the main institution of an efficient rational-legal system. In contrast, the orientation on common interests is much weaker within clientelism systems because individual interests and private relationships are the main forces maintaining the social organization. Consequently, “access to social resources is controlled by patrons and delivered to clients in exchange for deference and various forms of support”.