Which of the following is not an example of how trade agreements, like NAFTA, lower trade barriers?

Economic success prussia had a very strong economy, partly due to the success of the zollverein. stronger prussian army king wilhelm wanted to build a bigger, stronger army but was blocked by the prussian landtag (parliament).-credits to google for putting answer -credits to slideshare for making answer-credits to me for putting answer on brain.ly

It can provide a social code to protect each citizen's future economical earnings. and then obviously defending the country from invading countries.