Its neighbors always perceived the United States as an imminent security risk (ask Mexico, half of whose territory was captured by successive and aggressive American administrations). The two world wars transformed the USA into a global threat, able and only too willing to project power to protect its interests and disseminate its brand of missionary liberal-capitalism.
In the last 150 years, the USA has repeatedly militarily attacked, unprovoked, other peaceful or pacified nations, near and far. To further its (often economic) ends, the United States has not refrained from encouraging and using terrorism in various parts of the globe. It has developed and deployed weapons of mass destruction and is still the biggest arms manufacturer and trader in the world. It has repeatedly reneged on its international obligations and breached international laws and conventions.