If there is a general favor towards certain people, if he were to select otherwise, then people would think he was biased. This would result in a bad reputation towards him, with a worst case leading to him being impeached if the public sees enough corruption.
No one knew just how big Louisiana was. He acquired Louisiana from Spain in 1802 he sent troops to the New World it to go to in the US. Westines worried about the powerful branch especially that they might interfere with US trade by blocking access to the port of New Orleans
1. to control flooding
2. to supply water for agriculture, households, and industries