have been to America vs have been to the USA

Some examples from the web:

• And "California," because I have been to America.
• And then Nando would have been sent to America to chase his aspirations.
• - Have you ever been to America?
• You six... have been selected to explore America's worst nightmare.
• Meanwhile, we have been able to witness in America what these magicians are capable of.
• Do you think the girls could have been deployed here, to America?
• They have been suggested, as they have been to most of America.
• I brought the crocs craze to America.
• John came to America to flee Ceausescu.
• Her daughter was sent to America first.
• Ephraim came to America to be racing car driver.
• Your mother moved to America to follow her dreams.
• These are two tickets back to America.
• Tell Ada Freddie went to America.
• Niko's never been to America.
• Slaves were shipped to America and sold to plantation owners.
• He wants to take me to America.
• He needs Justin to come back to America.
• Welcome to America, my friend, land of opportunity.
• No promoter is sending this show to America.

Some examples from the web:

• It is hardly likely that the person in question would then have been able to travel to the USA, Canada or Australia with a stamp of this kind in his passport.
• On the issue of the environment, attention could have been drawn to the USA's opposition to more extensive international agreements in the area of the environment, most recently manifested in Kyoto.
• Calls on the Commission and the Council to state to what extent in the past few years, in spite of the current embargo, arms have been supplied to China by the USA and the countries of the European Union;
• In the USA demand significantly exceeds domestic supply.
• It was made in the USA.
• The USA has a vast biofuels programme.
• The USA is unilaterally prioritising military security policy.
• It has just been authorised for use in the USA.
• The USA remains of great importance.
• EU fur exports to the USA are currently twice as much as imports from the USA.
• The USA has incorporated into its programme of protection against terrorist threats a system of inspection entailing 100 % scanning of containers for export to the USA.
• Member states should therefore re-energise discussions on this subject with the USA in the next EU-USA Summit.
• Americans should not see relations with Europe solely in terms of relations between the USA and France, the USA and Great Britain, the USA and Germany, the USA and Greece, the USA and all the others.
• This section lists the USA national agencies that issue export certificates agreed to by the EC and the USA (5).
• We do not want to enter into and fulfill this commitment in place of the USA, but rather with the USA as an indispensable partner in the peace process.
• We are voting for the report because it is necessary to prevent Chapter 2 aircraft, which generate more pollution and noise, from the USA ending up in EU countries when they are no longer permitted in the USA.
• The USA, however, retains the right to require EU citizens travelling to the USA to obtain a visa.
• I believe that this Parliament will lose all credibility whatsoever if it moves towards a free trade zone with the USA, without the USA having previously complied with internationally agreed standards and norms.
• We should be clear on one thing: history teaches us that for example the League of Nations failed because this splendid idea emanated from the USA but the USA itself did not participate in it.
• Do not go into bed with the USA, because the USA's farm bill certainly went against the principles that we in the European Union want.