When walter devotes attention and practice to completing tax returns, and has gained experience in that area, he is demonstrating?

He is demonstrating "expertise".

Explanation:

When you have special skills in any field and you get that by working hard and paying attention to your work, then you are demonstrating expertise. We achieve expertise by doing lot of work, attention and care. if you have goals to become expert in your field, one day you will get expertise.

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usually, however, secession was popular enough without the of community leaders. prominent unionists, on the other hand, were a major reason that texas did not secede before march 1861. the most important of these was sam houston, the governor of the state from 1859 to 1861.

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