What obstacles did henry hudson face?

The obstacle he faced that he realize that the passage he tried to find was full of icebergs that made it impossible for ships to pass through.

Hudsons obstacles were ice bergs, freezing, hunger, getting lost at sea and death.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.