What is the main problem with punch-card voting devices?

How did the end of the mexican american war result in growing sectionalism in the united states?

The red arrow shows the direction that wind from the south pole would travel if earth were not spinning. the wind's destination is at point a. because earth is spinning in the direction shown by the blue arrow, the coriolis effect will cause the wind to terminate closest to which point?

Francisco loves to learn, but his lack of english makes him feel “nervous and scared.” why is he both happy and scared of school