What is the name for the way in which different religious or philosophical beliefs are blended together, as exemplified by the architectural style of angkor wat?

Syncretism is the combining or blending of beliefs and practices from different schools of thought, commonly in ethics, religion, and philosophy. It involves the merging or assimilation of different traditions originally thought to be discrete, and allows for unification and an inclusive approach to various beliefs and practices. When applied to arts and culture, syncretism is most commonly called "eclecticism," and when applied to politics, "syncretic politics." 

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.