Although I see the sense in matching time zones between jurisdictions engaged in significant mutual trade, following the United States with respect to daylight savings time is not that obvious. As you venture farther North, the seasonal variation in day length increases. If the rationale for DST is to align the populace's waking day with the sun, at a certain latitude you are bound to fall short. At some point, you will have to travel to and from work in the dark. What makes sense for Florida may not translate to Northern Ontario or Québec City.
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Although I see the sense in matching time zones between jurisdictions engaged in significant mutual trade, following the United States with respect to daylight savings time is not that obvious. As you venture farther North, the seasonal variation in day length increases. If the rationale for DST is to align the populace's waking day with the sun, at a certain latitude you are bound to fall short. At some point, you will have to travel to and from work in the dark. What makes sense for Florida may not translate to Northern Ontario or Québec City.