Because it is a human trait to learn from others and their expreiences. This however depends on the individuals who are meeting. If a person is repelled by anoter culture they will try to keep their way of live and usually not drift the other way. Similary if they find something they love they may incorperate this into their lives. This would mean the trend goes towards homogenisation.

Using the example of Texas Germans we can also see that even tho they are willing to keep old traditions alive but they still live fairly american lives essentially. In a way they are similar to both cultures but still bringing different ideas to both tables.

This is just an example however and dependend on individual and cultural ideas.
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