The Dow Jones Industrial Average reached another milestone: 22,000.

The weakening dollar over the past six months contributed to the rally.

Boeing (BA) contributed the most of the Dow's gains from 21,000 to 22,000. That company derives over 50% of its sales from overseas.

A weak dollar makes U.S. exports more attractive.

Watch More with TheStreet:

More from Video

REPLAY: Jim Cramer on Tariff Worries, Oil, Alphabet and Centene

REPLAY: Jim Cramer on Tariff Worries, Oil, Alphabet and Centene

Video: Athens Stock Exchange CEO on What's Next for Greece's Debt Woes

Video: Athens Stock Exchange CEO on What's Next for Greece's Debt Woes

Will Tesla CEO Elon Musk Really Pulverize the Haters?

Will Tesla CEO Elon Musk Really Pulverize the Haters?

Jim Cramer's Investing Rule #4: Buy Damaged Stocks, Not Damaged Companies

Jim Cramer's Investing Rule #4: Buy Damaged Stocks, Not Damaged Companies

Jim Cramer's Investing Rule #3: Don't Buy Stocks All at Once

Jim Cramer's Investing Rule #3: Don't Buy Stocks All at Once