Answer:
'Although their agricultural exports declined, their share of global manufacturing increased' is correct.
The invasions of Germanic groups led to a series of negative changes . Three effects of the Germanic invasions were halt on trade. Transportation of goods became unsafe. Less people were educated, and Europe no longer had one spoken language, unable to be understood by all.
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The answer would be the availability of new farming land in the west, while back east, most of their land had already been taken.