As a reminder, there is a difference between Israel and Judah. At this point in the chronological reading, the nations were separated, never to be joined again, until Jesus returns. The nation of Judah (plus the tribe of Benjamin and a small remnant of the other tribes) is known as the Jews. The rest of the tribes “the lost tribes” have been dispersed, many of them into the western nations.

Isaiah tells us in chapter 19 that the land of Judah will subjugate Egypt.  Well..this hasn't happened yet.  But it will - yet in our future.  When that happens the cities in Egypt will speak the language of Canaan and swear allegiance to the Lord.  In fact the people of Egypt will call out to the Lord and He will send them a savior and a defender who will rescue them.  During the year long Day of the Lord, all people will be given a chance to swear allegiance to the Lord.  It will be an urgent altar call, so to speak.

Isaiah 30 relates that God will "cause men to hear his majestic voice and will make them see his arm coming down."  

Isaiah 31 relates "...the Lord Almighty will come down to do battle on Mount Zion and on its heights..."

But "...the Lord Almighty will shield Jerusalem; he will shield it and deliver it, he will 'pass over' it and will rescue it."
Just as He did at the very first "Passover" in Egypt.

Isaiah 19:19
In that day there will be an altar to the LORD in the heart of Egypt, and a monument to the LORD at its border.

The land of Egypt in ancient times was divided into two parts; upper and lower Egypt. The boundary between these two nations is in the area of where Cairo and the Great Pyramid at Giza are today. Interestingly, the pyramid is located both on the border of upper and lower Egypt and in the heart of Egypt. 

In the Millennium:
Isaiah 19:23
In that day there will be a highway from Egypt to Assyria. The Assyrians will go to Egypt and the Egyptians to Assyria. The Egyptians and Assyrians will worship together.

Interestingly, Abraham (Abram) was the first to walk the Isaiah 19 highway. (Genesis 11:31, Acts 7:2-4)

God sure uses an unusual sign (Isaiah’s nakedness) to demonstrate the humiliation of Egypt and Cush at the hands of the Assyrians.   For us today, spiritually speaking, is this illustrating how our sins will be revealed, nothing will be hidden when we come before the judgment?

Isaiah foretells that Judah will reject the truth.

Isaiah 30:9-11
These are rebellious people, deceitful children, children unwilling to listen to the LORD's instruction. They say to the seers, "See no more visions!" and to the prophets, "Give us no more visions of what is right! Tell us pleasant things, prophesy illusions. Leave this way, get off this path, and stop confronting us with the Holy One of Israel!"

In other words, they were saying, “Tell us things we want to hear”. Isaiah warned about this and so did Paul.

2 Timothy 4:3-4
For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear. They will turn their ears away from the truth and turn aside to myths.

Turning “aside to myths” is comparable to worshiping God on pagan high places. This warning of worshiping God on pagan high places has been repeated many, many times in the last few weeks. What did God warn about that?

As always God gives us a chance for redemption.

Isaiah 30:21
Whether you turn to the right or to the left, your ears will hear a voice behind you, saying, "This is the way; walk in it."

Can’t you just imagine Him whispering this in our ears? This creator of the universe, caring enough about us to whisper in our ears! Amazing!