In 2017, the United States admitted approximately 53, 716 refugees.  The top countries of origin in 2017 for refugees coming to the US were: the Democratic Republic of Congo (7,878), Myanmar (3,555), Ukraine (2,635), & Bhutan (2,228).  

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As to approved asylum applications in the US in 2017, there were 26,382 approvals.  43% of the all asylum applications were from peoples from El Salvador.  

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As to events in 2017 that caused displacement in the world, UNHCR reported that 68.5 million people around the world were displaced by various conflicts:
(1) The Syrian Civil War: By the end of 2017, 6.3 million were internally displaced, & 5.5 million became refugees seeking refuge in other countries. 
(2) South Sudan Civil War: Because of this conflict, around 4 million were displaced both internally & across their borders. 
(3) The Rohingya Crisis in Myanmar: 740,000 Rohingya fled to Bangladesh in a just of weeks due to a brutal military crackdown in Rakhine State.
(4) Venezuela's Political & Economic Collapse: Over 1.5 million people left Venezuela by the end of 2017 due to the economic collapse, food shortages, & political repression.
(5) ISIS's Battle for the City of Mosul in Iraq: Because of this specific battle, there were over 3 million internally displaced peoples.  
(6) The Conflict in Afghanistan: there were over 1.8 million internally displaced peoples due to the Taliban insurgency, civilian casualties, & deteriorating security.  
(7) Natural Disasters: 18 million people were globally displaced due to natural disasters from: Puerto Rico, Dominican Republic, Bangladesh, India, & Nepal.