Melissa Block

Think about the avocados you mash for your Super Bowl guacamole, or the fresh tomatoes you enjoy in the winter. There's a good chance they came from Mexico.

Our southern neighbor is the United States' leading supplier of fresh produce, providing 70 percent of the fresh vegetables we import and more than 40 percent of our fresh fruit imports. That trade has boomed since NAFTA — the North American Free Trade Agreement — was signed in 1994.

Pick a street corner in downtown Hamtramck, Mich., and you'll be struck by the incredible mix of cultures crammed into this tiny, 2-square-mile city.

A Catholic church across the street from a mosque. Polish pastry shops, sausage factories, and grocery stores promising "the best Polish food, shipping to Eastern Europe," side by side with Bengali clothing shops that sell richly embroidered dresses and headscarves. And you'd be remiss if you didn't stop in the many Yemeni restaurants serving fragrant lamb and discs of flatbread the size of hubcaps.

Think of the Mississippi Delta. Maybe you imagine cotton fields, sharecroppers and blues music.

It's been all that. But for more than a century, the Delta has also been a magnet for immigrants. I was intrigued to learn about one immigrant group in particular: the Delta Chinese.

To find out more, I travelled to Greenville, Miss., a small city along the Mississippi River. I meet Raymond Wong in Greenville's Chinese cemetery, right across a quiet road from an African-American cemetery. Wong's family has long been part of a thriving — but separate — Chinese community.

We hear a lot about U.S. companies laying off workers and shipping jobs overseas.

So, amid the global pressures to downsize, how do you hang onto your workforce?

We went looking for answers in Chelsea, Mich., home to a family owned manufacturer that's managed to thrive over four generations, since the company's founding in 1907.

The Chelsea Milling Co. is better known as the manufacturer of Jiffy baking mixes. You know the ones. They come in those signature little blue and white boxes: mixes for muffins, cakes, pie crusts, biscuits, brownies and more.

If you're in Clarksdale, Miss., home of the Delta blues, everybody says you have to go to Red's juke joint. The hole-in-the-wall club is the real deal. It's just a small room, a few tables and a fridge full of beer. Red lights are strung around a low ceiling. On the night we visit, octogenarian Leo "Bud" Welch plays in the center of the room, hunched over a sparkly, hot pink, electric guitar. Red Paden, the owner, sits out front, surveying from behind the bar.

You want to find pigs? Go to Iowa.

It's the largest pork producer in the country. The ratio of pigs to people in Iowa is about 7 to 1.

I've had a hankering to spend some time on a farm for my series "Our Land." Over the next few months, I'll be out on a road trip, visiting communities large and small, and talking with people about what's important in their lives.

So with farming in mind, off to Iowa we went — to Buchanan County in northeastern Iowa.

What becomes of a town when its heyday has passed? What convinces young people to stay when good jobs vanish?

Those are questions many towns across America have been trying to answer for years.

And they were on my mind when I headed to Independence, Kan., with a dwindling population that's now below 9,000. It's in the southeastern corner of the state, not far from the Oklahoma border.

Independence has much to boast about.

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A week away from turning 99 years old, Frances Kolarek has a long view of life and presidential elections.

Born in 1917, three years before women won the right to vote, she cast her first presidential vote for Franklin Delano Roosevelt. Now, in 2016, she has cast her vote early for Hillary Clinton.

"I think she is undoubtedly the most qualified candidate for the presidency that we have seen in my lifetime," she says from her home at the retirement community where she lives, independently, outside Washington, D.C.

Imagine: the chance to live on an uninhabited tropical island for a month, off the grid, creating art.

No phone, no television, no Internet.

Instead, spectacular night skies, crystalline turquoise waters and extraordinary marine life on the coral reef just a short swim from your back door.